Murray fought to a draw in a world title fight in Germany with Sturm and more importantly, is actually a known name in the UK. Barker wasn't a fight anybody wanted, including Martinez, but he was the only person willing to fight Martinez at that point in time.

Martinez has fought tough opponents for not great pay for years, he's now in a position to look for fights that make more money. Like it or not, Murray going to Argentina will probably make him more than GGG.

Uh no he wasn't

And so what if Murray fought to a draw with Sturm? What does that mean? Golovkin has actually had American exposure with an impressive knockout win on HBO. I don't see how Murray makes him more money.